{"id":202733,"date":"2025-05-22T11:08:29","date_gmt":"2025-05-22T03:08:29","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202733\/"},"modified":"2025-05-22T11:08:29","modified_gmt":"2025-05-22T03:08:29","slug":"%e5%a4%9a%e7%ba%bf%e7%a8%8b%e7%8e%af%e5%a2%83%e4%b8%8b-java-%e5%87%bd%e6%95%b0%e5%a4%b1%e6%95%88%e6%97%b6%e7%9a%84%e5%85%b7%e4%bd%93%e8%a1%a8%e7%8e%b0%e5%92%8c%e5%88%86%e6%9e%90%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202733\/","title":{"rendered":"\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b Java \u51fd\u6570\u5931\u6548\u65f6\u7684\u5177\u4f53\u8868\u73b0\u548c\u5206\u6790\uff1f"},"content":{"rendered":"

<\/b> <\/p>\n

\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b Java \u51fd\u6570\u5931\u6548\u65f6\u7684\u5177\u4f53\u8868\u73b0\u548c\u5206\u6790\uff1f<\/h1>\n

\u6b22\u8fce\u5404\u4f4d\u5c0f\u4f19\u4f34\u6765\u5230\uff0c\u76f8\u805a\u4e8e\u6b64\u90fd\u662f\u7f18\u54c8\u54c8\u54c8\uff01\u4eca\u5929\u6211\u7ed9\u5927\u5bb6\u5e26\u6765\u300a\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b Java \u51fd\u6570\u5931\u6548\u65f6\u7684\u5177\u4f53\u8868\u73b0\u548c\u5206\u6790\uff1f\u300b<\/span>\uff0c\u8fd9\u7bc7\u6587\u7ae0\u4e3b\u8981\u8bb2\u5230<\/span>\u7b49\u7b49\u77e5\u8bc6\uff0c\u5982\u679c\u4f60\u5bf9\u6587\u7ae0<\/span>\u76f8\u5173\u7684\u77e5\u8bc6\u975e\u5e38\u611f\u5174\u8da3\u6216\u8005\u6b63\u5728\u81ea\u5b66\uff0c\u90fd\u53ef\u4ee5\u5173\u6ce8\u6211\uff0c\u6211\u4f1a\u6301\u7eed\u66f4\u65b0\u76f8\u5173\u6587\u7ae0\uff01\u5f53\u7136\uff0c\u6709\u4ec0\u4e48\u5efa\u8bae\u4e5f\u6b22\u8fce\u5728\u8bc4\u8bba\u7559\u8a00\u63d0\u51fa\uff01\u4e00\u8d77\u5b66\u4e60\uff01<\/p>\n

\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b Java \u51fd\u6570\u5931\u6548\u65f6\u8868\u73b0\u4e3a\u51fd\u6570\u7ed3\u679c\u4e0d\u4e00\u81f4\u3001\u6b7b\u9501\u6216\u5f02\u5e38\u3002\u5e38\u89c1\u539f\u56e0\u5305\u62ec\u672a\u540c\u6b65\u8bbf\u95ee\u5171\u4eab\u53d8\u91cf\u3001\u7ade\u6001\u6761\u4ef6\u548c\u6b7b\u9501\u3002\u89e3\u51b3\u65b9\u6cd5\u6709\u4f7f\u7528\u540c\u6b65\u673a\u5236\u3001\u907f\u514d\u7ade\u6001\u6761\u4ef6\u548c\u7a81\u7834\u6b7b\u9501\u3002<\/p>\n

<\/p>\n

\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b Java \u51fd\u6570\u5931\u6548\u65f6\u7684\u5177\u4f53\u8868\u73b0\u548c\u5206\u6790<\/h2>\n

\u7279\u5f81<\/h3>\n

\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e2d\uff0cJava \u51fd\u6570\u5931\u6548\u7684\u5177\u4f53\u8868\u73b0\u53ef\u80fd\u5305\u62ec\uff1a<\/p>\n

    \n
  • \u51fd\u6570\u6267\u884c\u7ed3\u679c\u4e0d\u4e00\u81f4<\/li>\n
  • \u7a0b\u5e8f\u53d1\u751f\u6b7b\u9501\u6216\u5f02\u5e38<\/li>\n
  • \u51fd\u6570\u8fd4\u56de\u9519\u8bef\u503c<\/li>\n<\/ul>\n

    \u5e38\u89c1\u539f\u56e0<\/h3>\n

    \u5bfc\u81f4 Java \u51fd\u6570\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e2d\u5931\u6548\u7684\u5e38\u89c1\u539f\u56e0\u5305\u62ec\uff1a<\/p>\n

      \n
    • \u5171\u4eab\u53d8\u91cf\u672a\u540c\u6b65\u8bbf\u95ee\uff1a<\/strong>\u591a\u4e2a\u7ebf\u7a0b\u5e76\u53d1\u8bbf\u95ee\u5171\u4eab\u53d8\u91cf\u65f6\uff0c\u53ef\u80fd\u4f1a\u51fa\u73b0\u6570\u636e\u4e0d\u4e00\u81f4\uff0c\u4ece\u800c\u5bfc\u81f4\u51fd\u6570\u5931\u6548\u3002<\/li>\n
    • \u7ade\u6001\u6761\u4ef6\uff1a<\/strong>\u5f53\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u6267\u884c\u5bfc\u81f4\u8d44\u6e90\u6539\u53d8\u7684\u4ee3\u7801\u65f6\uff0c\u4f1a\u5bfc\u81f4\u7ade\u6001\u6761\u4ef6\uff0c\u4ece\u800c\u51fa\u73b0\u96be\u4ee5\u9884\u6d4b\u7684\u884c\u4e3a\u3002<\/li>\n
    • \u6b7b\u9501\uff1a<\/strong>\u5f53\u4e24\u4e2a\u6216\u591a\u4e2a\u7ebf\u7a0b\u76f8\u4e92\u7b49\u5f85\u5bf9\u65b9\u91ca\u653e\u9501\u65f6\uff0c\u4f1a\u5bfc\u81f4\u6b7b\u9501\u3002\u8fd9\u901a\u5e38\u53d1\u751f\u5728\u9700\u8981\u591a\u4e2a\u9501\u624d\u80fd\u5b8c\u6210\u4efb\u52a1\u7684\u60c5\u51b5\u4e0b\u3002<\/li>\n<\/ul>\n

      \u5b9e\u6218\u6848\u4f8b<\/h3>\n

      \u8003\u8651\u4ee5\u4e0b\u4ee3\u7801\u793a\u4f8b\uff1a<\/p>\n

      public class Counter {\n\n    private int count = 0;\n\n    public synchronized int incrementAndReturn() {\n        return ++count;\n    }\n}<\/pre>\n
      \u5728\u6b64\u793a\u4f8b\u4e2d\uff0cCounter<\/code> \u7c7b\u7ef4\u62a4\u4e86\u4e00\u4e2a\u6574\u6570 count<\/code>\u3002incrementAndReturn<\/code> \u65b9\u6cd5\u5bf9 count<\/code> \u8fdb\u884c\u81ea\u589e\u5e76\u8fd4\u56de\u65b0\u503c\u3002\u4e3a\u4e86\u786e\u4fdd\u7ebf\u7a0b\u5b89\u5168\u7684\u8bbf\u95ee\uff0c\u8be5\u65b9\u6cd5\u88ab\u6807\u8bb0\u4e3a synchronized<\/code>\u3002<\/p>\n
      \u73b0\u5728\uff0c\u5047\u8bbe\u6709\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u8c03\u7528 incrementAndReturn<\/code> \u65b9\u6cd5\uff1a<\/p>\n
      public class Main {\n\n    public static void main(String[] args) {\n        Counter counter = new Counter();\n\n        Thread t1 = new Thread(() -> {\n            for (int i = 0; i < 10000; i++) {\n                counter.incrementAndReturn();\n            }\n        });\n\n        Thread t2 = new Thread(() -> {\n            for (int i = 0; i < 10000; i++) {\n                counter.incrementAndReturn();\n            }\n        });\n\n        t1.start();\n        t2.start();\n        t1.join();\n        t2.join();\n\n        System.out.println(counter.count); \/\/ \u53ef\u80fd\u4e0d\u7b49\u4e8e 20000\n    }\n}<\/pre>\n
      \u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6ca1\u6709\u5bf9\u5171\u4eab\u53d8\u91cf count<\/code> \u8fdb\u884c\u540c\u6b65\uff0c\u56e0\u6b64\u7ebf\u7a0b\u53ef\u80fd\u5e76\u53d1\u4fee\u6539\u8be5\u53d8\u91cf\uff0c\u5bfc\u81f4\u6700\u7ec8\u503c\u4e0d\u6b63\u786e\u3002<\/p>\n
      \u89e3\u51b3\u65b9\u6cd5<\/h3>\n
      \u907f\u514d\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b Java \u51fd\u6570\u5931\u6548\u7684\u89e3\u51b3\u65b9\u6848\u5305\u62ec\uff1a<\/p>\n
        \n
      • \u4f7f\u7528\u540c\u6b65\u673a\u5236\uff1a<\/strong>\u901a\u8fc7\u9501\u6216\u539f\u5b50\u53d8\u91cf\u7b49\u540c\u6b65\u673a\u5236\u786e\u4fdd\u5171\u4eab\u53d8\u91cf\u7684\u539f\u5b50\u8bbf\u95ee\u3002<\/li>\n
      • \u907f\u514d\u7ade\u6001\u6761\u4ef6\uff1a<\/strong>\u901a\u8fc7\u8bbe\u8ba1\u4ee3\u7801\u4ee5\u907f\u514d\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u6267\u884c\u5173\u952e\u90e8\u5206\u3002<\/li>\n
      • \u7a81\u7834\u6b7b\u9501\uff1a<\/strong>\u4f7f\u7528\u6b7b\u9501\u68c0\u6d4b\u548c\u9884\u9632\u673a\u5236\uff0c\u4f8b\u5982\u8d85\u65f6\u6216\u6b7b\u9501\u68c0\u6d4b\u5e93\u3002<\/li>\n<\/ul>\n
        \u4ee5\u4e0a\u5c31\u662f\u672c\u6587\u7684\u5168\u90e8\u5185\u5bb9\u4e86\uff0c\u662f\u5426\u6709\u987a\u5229\u5e2e\u52a9\u4f60\u89e3\u51b3\u95ee\u9898\uff1f\u82e5\u662f\u80fd\u7ed9\u4f60\u5e26\u6765\u5b66\u4e60\u4e0a\u7684\u5e2e\u52a9\uff0c\u8bf7\u5927\u5bb6\u591a\u591a\u652f\u6301\uff01\u66f4\u591a\u5173\u4e8e\u6587\u7ae0\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u4e5f\u53ef\u5173\u6ce8\u516c\u4f17\u53f7\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
        \u591a\u7ebf\u7a0b\u73af\u5883\u4e0b Java \u51fd\u6570\u5931\u6548...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-202733","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202733","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=202733"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202733\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202733"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202733"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202733"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}